Not just yes, but also that if it could be seen in a dry area, there is remedial action you can take. If you don't know it is occuring because it is hidden by water on the protected side, it will eventually undermine that whole section of the levee and cause a major failure above it.
That's what I wondered: if the breech at the river levy could even be seen, considering all the flooding. My goodness gracious... there may be water coming in from the river and a bigger catastrophe in the works.